arch/sh/kernel/vsyscall/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 obj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o
   3
   4 $(obj)/vsyscall-syscall.o: \
   5         $(foreach F,trapa,$(obj)/vsyscall-$F.so)
   6
   7 # Teach kbuild about targets
   8 targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so)
   9 targets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o
  10
  11 # The DSO images are built using a special linker script
  12 quiet_cmd_syscall = SYSCALL $@
  13       cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \
  14                            -Wl,-T,$(filter-out FORCE,$^) -o $@
  15
  16 export CPPFLAGS_vsyscall.lds += -P -C -Ush
  17
  18 vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 \
  19                 $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
  20
  21 SYSCFLAGS_vsyscall-trapa.so     = $(vsyscall-flags)
  22
  23 $(obj)/vsyscall-trapa.so: \
  24 $(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
  25         $(call if_changed,syscall)
  26
  27 # We also create a special relocatable object that should mirror the symbol
  28 # table and layout of the linked DSO.  With ld -R we can then refer to
  29 # these symbols in the kernel code rather than hand-coded addresses.
  30 SYSCFLAGS_vsyscall-dummy.o = -r
  31 $(obj)/vsyscall-dummy.o: $(src)/vsyscall.lds \
  32                         $(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE
  33         $(call if_changed,syscall)
  34
  35 LDFLAGS_vsyscall-syms.o := -r -R
  36 $(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE
  37         $(call if_changed,ld)